EP2780099B1 - Chilled ammonia based co2 capture system with wash system and processes of use - Google Patents
Chilled ammonia based co2 capture system with wash system and processes of use Download PDFInfo
- Publication number
- EP2780099B1 EP2780099B1 EP12779260.4A EP12779260A EP2780099B1 EP 2780099 B1 EP2780099 B1 EP 2780099B1 EP 12779260 A EP12779260 A EP 12779260A EP 2780099 B1 EP2780099 B1 EP 2780099B1
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- EP
- European Patent Office
- Prior art keywords
- ammonia
- feed stream
- wash
- liquid
- flue gas
- Prior art date
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims description 403
- 229910021529 ammonia Inorganic materials 0.000 title claims description 197
- 238000000034 method Methods 0.000 title claims description 40
- 239000007788 liquid Substances 0.000 claims description 82
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 65
- 239000003546 flue gas Substances 0.000 claims description 64
- 239000006096 absorbing agent Substances 0.000 claims description 37
- 238000010521 absorption reaction Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000012530 fluid Substances 0.000 claims description 18
- 238000001728 nano-filtration Methods 0.000 claims description 12
- 238000001223 reverse osmosis Methods 0.000 claims description 12
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 62
- 239000001569 carbon dioxide Substances 0.000 description 54
- 229910002092 carbon dioxide Inorganic materials 0.000 description 54
- 238000012856 packing Methods 0.000 description 22
- 239000007789 gas Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 18
- 239000000356 contaminant Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- 238000011084 recovery Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000012465 retentate Substances 0.000 description 8
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 7
- 238000000746 purification Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 7
- -1 amine compounds Chemical class 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 4
- 230000002745 absorbent Effects 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 239000001099 ammonium carbonate Substances 0.000 description 4
- 239000006193 liquid solution Substances 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 235000012501 ammonium carbonate Nutrition 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PVOAHINGSUIXLS-UHFFFAOYSA-N 1-Methylpiperazine Chemical compound CN1CCNCC1 PVOAHINGSUIXLS-UHFFFAOYSA-N 0.000 description 2
- GIAFURWZWWWBQT-UHFFFAOYSA-N 2-(2-aminoethoxy)ethanol Chemical compound NCCOCCO GIAFURWZWWWBQT-UHFFFAOYSA-N 0.000 description 2
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 229940058020 2-amino-2-methyl-1-propanol Drugs 0.000 description 2
- WFCSWCVEJLETKA-UHFFFAOYSA-N 2-piperazin-1-ylethanol Chemical compound OCCN1CCNCC1 WFCSWCVEJLETKA-UHFFFAOYSA-N 0.000 description 2
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- LVTYICIALWPMFW-UHFFFAOYSA-N diisopropanolamine Chemical compound CC(O)CNCC(C)O LVTYICIALWPMFW-UHFFFAOYSA-N 0.000 description 2
- 229940043276 diisopropanolamine Drugs 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 229910052815 sulfur oxide Inorganic materials 0.000 description 2
- LXHZHWNSCIJUDB-UHFFFAOYSA-N 2-[2-(2-methylbutan-2-ylamino)ethoxy]ethanol Chemical compound CCC(C)(C)NCCOCCO LXHZHWNSCIJUDB-UHFFFAOYSA-N 0.000 description 1
- FWURKFBXTRYYIO-UHFFFAOYSA-N 2-[2-(3-methylpentan-3-ylamino)ethoxy]ethanol Chemical compound CCC(C)(CC)NCCOCCO FWURKFBXTRYYIO-UHFFFAOYSA-N 0.000 description 1
- WRUALCZLIFZHEL-UHFFFAOYSA-N 2-[2-(propan-2-ylamino)propoxy]ethanol Chemical compound CC(C)NC(C)COCCO WRUALCZLIFZHEL-UHFFFAOYSA-N 0.000 description 1
- YDEDDFNFQOPRQJ-UHFFFAOYSA-N 2-[2-(tert-butylamino)ethoxy]ethanol Chemical compound CC(C)(C)NCCOCCO YDEDDFNFQOPRQJ-UHFFFAOYSA-N 0.000 description 1
- KYDUKWREWFLJJL-UHFFFAOYSA-N 2-[2-(tert-butylamino)propoxy]ethanol Chemical compound CC(C)(C)NC(C)COCCO KYDUKWREWFLJJL-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 102100032040 Amphoterin-induced protein 2 Human genes 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 101000776165 Homo sapiens Amphoterin-induced protein 2 Proteins 0.000 description 1
- KWYCPUNAAYFHAK-UHFFFAOYSA-N N-(2,6-Dimethylphenyl)-4-[[(diethylamino)acetyl]amino]benzamide Chemical compound C1=CC(NC(=O)CN(CC)CC)=CC=C1C(=O)NC1=C(C)C=CC=C1C KWYCPUNAAYFHAK-UHFFFAOYSA-N 0.000 description 1
- OPKOKAMJFNKNAS-UHFFFAOYSA-N N-methylethanolamine Chemical compound CNCCO OPKOKAMJFNKNAS-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 241000529895 Stercorarius Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012527 feed solution Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 150000003141 primary amines Chemical class 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/0005—Degasification of liquids with one or more auxiliary substances
- B01D19/001—Degasification of liquids with one or more auxiliary substances by bubbling steam through the liquid
- B01D19/0015—Degasification of liquids with one or more auxiliary substances by bubbling steam through the liquid in contact columns containing plates, grids or other filling elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/007—Energy recuperation; Heat pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/143—Fractional distillation or use of a fractionation or rectification column by two or more of a fractionation, separation or rectification step
- B01D3/145—One step being separation by permeation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/027—Nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/102—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2311/00—Details relating to membrane separation process operations and control
- B01D2311/26—Further operations combined with membrane separation processes
- B01D2311/2626—Absorption or adsorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Definitions
- the present disclosure generally relates to gas purification systems and processes of use, wherein absorbed ammonia and carbon dioxide are recovered.
- the present disclosure relates to wash systems and processes configured to utilize nanofiltration or reverse osmosis to reduce the steam duties of an ammonia recovery stripper for reducing the ammonia slip and other contaminants from a gas stream that has been subjected to an ammonia-based CO 2 removal process.
- impurities such as H 2 S, CO 2 and/or COS are removed from a gas stream such as flue gas, natural gas, syngas or other gas streams by absorption in a liquid solution, e.g., in a liquid solution comprising ammonia and/or one or more amine compounds.
- the used liquid solution is subsequently regenerated in a regenerator column to release the impurities comprised in the solution, typically by countercurrent contacting with steam.
- the steam needed for regeneration is typically produced by power plant turbine system.
- a reboiler in fluid communication with the regeneration column may provide further release of impurities comprised in the liquid solution.
- ammonia slip from the main CO 2 absorber is first captured in a water wash vessel and subsequently regenerated in the ammonia recovery stripper by heating the ammoniated rich solution with saturated steam.
- the ammoniated slip solution typically has a NH 3 molarity of 0.1 to 2.0 mol/liter depending on the operating conditions.
- the current ammonia recovery process from the stripper is an expensive process (approximately 20% heat duty of the main CO 2 regenerator) in terms of both capital and operating cost because it is very difficult to integrate stripper overhead heat with the main regenerator network.
- US 7,846,240 describes a method and system for reducing an amount of ammonia in a flue gas stream.
- US 2011/0100218 describes a method for combining desalination and osmotic power with carbon dioxide capture.
- DE 198 08 433 A1 describes a process and an apparatus for reducing ammonia from waste water.
- This process comprises a separating unit splitting the waste water in a retentate and a permeate.
- the retentate is conveyed to a stripping column where ammonia is stripped from the waste water.
- ammonia is stripped from the waste water.
- To reduce the energy consumption of the system gas from the top of the stripping column is conveyed to two catalysts where exothermic reactions take place to split or convert the ammonia to nitrogen and water. The heat from these exothermic reactions is recovered and used for heating the waste water before entering the stripping column.
- a wash system for reducing ammonia slip in a chilled ammonia-based CO 2 removal system comprising a main absorber and regenerator and also comprises a wash vessel configured to receive a CO 2 lean flue gas subjected to the chilled ammonia-based CO 2 removal system, the wash vessel comprising a liquid for washing the CO 2 lean flue gas from the main absorber; a separation unit in series with the wash vessel and configured to receive washed liquid having an ammonia concentration from the wash vessel and physically separate the washed liquid into a first feed stream and a second feed stream, wherein the first feed stream has a decreased ammonia concentration relative to the ammonia concentration of the washed liquid, and wherein the second feed stream has an increased ammonia concentration relative to the ammonia concentration of the washed liquid; and a stripper system in series with the separation unit and configured to receive the second feed stream
- the process for reducing an amount of ammonia in a CO 2 lean flue gas stream resulting from an ammonia-based CO 2 capture system comprising a main absorber and regenerator comprises washing the CO 2 lean flue gas stream from the main absorber in a wash vessel with a liquid to produce a washed liquid having an ammonia concentration; separating the washed liquid into a first feed stream and a second feed stream, wherein the first feed stream has a decreased ammonia concentration relative to the ammonia concentration of the washed liquid, and wherein the second feed stream has an increased ammonia concentration relative to the ammonia concentration of the washed liquid; and recovering ammonia from the second feed stream to produce an ammonia lean solution.
- systems and processes for purification of a gas stream such as a flue gas are configured to reduce the energy requirements of prior chilled ammonia processes and systems ("CAP") used in carbon capture systems (“CCS").
- CAP chilled ammonia processes and systems
- CCS carbon capture systems
- the systems and processes are configured to recover absorbed ammonia and carbon dioxide (CO 2 ) from a flue gas stream that has been subjected to a chilled ammonia-based CO 2 removal system. More particularly, ammonia and CO 2 are recovered using nanofiltration or reverse osmosis on the feed stream from the wash vessel to provide a high molarity ammonia feed stream to the ammonia recovery stripper.
- the wash vessel is in fluid communication with the main absorber unit and is configured to receive the flue gas feed stream with the ammonia slip as well as other contaminants, i.e., the flue gas that has been subjected to ammonia-based CO 2 removal.
- FIG. 1 there is schematically illustrated a partial view of wash system 100 in accordance with one embodiment for recovering ammonia slip in a chilled ammonia-based CO2 removal system generally including a main absorber and regenerator for treating a flue gas, for example.
- the system 100 generally depicts, in series, a water wash vessel 102 for receiving an absorber retentate 106 (also referred to as the CO2 lean flue gas) from a main absorber (not shown), a nanofiltration or reverse osmosis system 108, and a stripper system 104.
- the complete chilled ammonia-based CO2 removal system will include additional components such as the main absorber and main regenerator as well as flue gas conditioning components for treating the flue gas stream prior to introduction into the main absorber and CO2 dehydration and compression components.
- additional components such as the main absorber and main regenerator as well as flue gas conditioning components for treating the flue gas stream prior to introduction into the main absorber and CO2 dehydration and compression components.
- Exemplary gas purification systems with these additional components including but not limited to the absorber and the regenerator, are disclosed in US Patent Nos. 7,641,717 , 7,846,240 , and 7,862,788 .
- the process stream employed in gas purification systems may be any fluid stream such as, for example, natural gas streams, synthesis gas streams, refinery gas or streams generated from combustion of materials such as coal, natural gas or other fuels.
- One example of process stream is a flue gas stream generated by combustion of a fuel such as, for example, coal, and provided at an output of a combustion chamber of a fossil fuel fired boiler.
- fuels include, but are not limited to natural gas, synthetic gas (syngas), and petroleum refinery gas.
- the acidic component(s) may be in a gaseous, liquid or particulate form.
- flue gas stream For ease of understanding, reference herein will be made to a flue gas stream.
- the flue gas stream contains several acidic components including, but not limited to, CO 2 .
- the flue gas stream may have undergone treatment to remove particulate matter (e.g., fly ash), as well as sulfur oxides (SOx) and nitrogen oxides (NOx).
- the flue gas may be taken from a location downstream of a wet flue gas desulfurization system.
- processes may vary from system to system and therefore, such treatments may occur after the flue gas stream passes through the absorber, or not at all.
- the main absorber employs an absorbent solution (disposed therein) that facilitates the absorption and the removal of a gaseous component such as carbon dioxide from the flue gas stream.
- the absorbent solution includes a chemical solvent and water, where the chemical solvent contains, for example, a nitrogen-based solvent and, in particular, ammonia; primary, secondary and tertiary alkanolamines; primary and secondary amines; sterically hindered amines; and severely sterically hindered secondary aminoether alcohols.
- Examples of commonly used chemical solvents include, but are not limited to: ammonium carbonate, monoethanolamine (MEA), diethanolamine (DEA), diisopropanolamine (DIPA), N-methylethanolamine, triethanolamine (TEA), N-methyldiethanolamine (MDEA), piperazine, N-methylpiperazine (MP), N-hydroxyethylpiperazine (HEP), 2-amino-2-methyl-1-propanol (AMP), 2-(2-aminoethoxy)ethanol (also called diethyleneglycolamine or DEGA), 2-(2-tert-butylaminopropoxy)ethanol, 2-(2-tert-butylaminoethoxy)ethanol (TBEE), 2-(2-tert-amylaminoethoxy)ethanol, 2-(2-isopropylaminopropoxy)ethanol, 2-(2-(1-methyl-1-ethylpropylamino)ethoxy)ethanol, and the like.
- the foregoing may be used individually or in combination, and with or without other co
- the absorbent solution in the main CO 2 absorber is a solution or slurry including ammonia.
- the ammonia can be in the form of ammonium ion, NH 4 + or in the form of dissolved molecular NH 3 .
- the absorbent solution or slurry may be comprised of ammonium carbonate, carbamate and bicarbonate ions.
- the absorption of the acidic components such as CO 2 present in the flue gas stream is achieved when the absorber is operated at atmospheric pressure and at a low temperature, for example, between zero and thirty degrees Celsius (0-30°C).
- absorption of the acidic component from flue gas stream is achieved when the absorber is operated at atmospheric pressure and at a temperature between zero and ten degrees Celsius (0-10° C). By operating at relatively low temperatures, ammonia loss within the system is minimized.
- the ammonia reacts with the CO 2 present in the flue gas to form ammonium carbonate, ammonium bicarbonate, ammonium carbamate, and the like and form a CO 2 lean flue gas stream.
- the process may generally be referred to as the main scrubbing process. After scrubbing, contaminants such as trace amounts of ammonia (also referred to as the ammonia slip), amine compounds and other degradation products remain in the CO 2 lean flue gas.
- the CO 2 lean flue gas with the contaminants is fed to an ammonia slip recovery system 100, wherein the ammonia and other contaminants are removed from the CO 2 lean flue gas, which may then be discharged into the atmosphere or further processed within a direct contact heater (DCH) before discharging to the atmosphere via stack.
- DCH direct contact heater
- the ammonia slip recovery system 100 includes, in series, the water wash vessel 102, the nanofiltration or reverse osmosis system 108, and the stripper system 104 to recover the ammonia, and other contaminants that may be contained therein.
- the wash vessel 102 generally includes one or more absorption stages.
- the wash vessel includes a first absorption stage 109 and a second absorption stage 110.
- the wash vessel is not limited in this regard as it is contemplated that the wash vessel may have more or less absorption stages.
- Each of the absorption stages may include a mass transfer device 112, a spray head system 114, and a liquid delivery path 116.
- the CO 2 lean flue gas 106 from the absorber enters the first absorption stage 109 at a bottom portion of the wash vessel 102. While the opening is shown at the bottom portion, it is contemplated that the CO 2 lean flue gas 106 may be at any point in the wash vessel and may vary from system to system depending on the application.
- the mass transfer device 112 may include packing, such as, for example, random packing, hydrophilic packing, and/or structural packing.
- Random packing is generally known in the art and refers to packing material introduced to the absorption stage in an un-organized fashion. Examples of random packing include, but are not limited to plastic, metal and/or ceramic packing material offered in different sizes, e.g., material having varying diameters, for example, diameters ranging between about 2.5 centimeters (2.5 cm) to about 7.6 centimeters (7.6 cm) (about 1 inch to about 3 inches). Random packing material is available from many suppliers, including, but not limited to Jaeger Products Inc. (Houston, Tex., United States). Random packing material may also include wood. Hydrophilic packing includes, but is not limited to polypropylene bags.
- Structural packing is generally known in the art and refers to packing material that is arranged or organized in a specific fashion. Typically, structural packing is arranged in a manner to force fluids to take a complicated path, thereby creating a large surface area for contact between the liquid and gas. Structural packing includes, but is not limited to structures made of metal, plastic, wood, and the like. It is contemplated that different packing materials facilitate ammonia removal or reduction at different flow rates of a liquid into the wash vessel 102. Additionally, it is contemplated that the different packing materials may provide more suitable pressure drops.
- one of the absorption stages 109 or 110 of the wash vessel 102 includes random packing material as the mass transfer device 112 and another of the absorption stages 109 or 110 of the wash vessel 102 includes structural packing as the mass transfer device.
- first absorption stage 109 may include random packing material as the mass transfer device 112
- second absorption stage 110 may include structural packing as the mass transfer device. It is contemplated that the CO 2 lean flue gas 106 enters the wash vessel 102 and passes through the first absorption stage 109 prior to passing through the second absorption stage 110.
- the mass transfer device 112 is located beneath the spray head system 114.
- Each of the spray head system 114 in wash vessel 102 sprays a liquid into the absorption stages 109, 110.
- the liquid is transported to the spray head system 114 via one of the liquid delivery paths 116.
- the liquid delivery paths 116 are conduits that transport the liquid to the respective spray head system 114.
- the liquid may be any liquid suitable to facilitate the removal of ammonia from the CO 2 lean flue gas 106.
- An example of a suitable liquid is water, which is known to absorb, i.e., dissolve, ammonia through interactions between the ammonia and the water.
- the liquid introduced to the second absorption stage 110 is liquid, e.g., water, provided by a stripping column 120. That is, water that has had all or substantially all of the ammonia as well as other contaminants contained therein removed and/or substantially removed.
- the liquid provided to the first absorption stage 109 is liquid 118 (also referred to as the washed liquid), which is water-containing a low concentration of ammonia recycled from the bottom of the wash vessel 102, which may be passed via pump 122 through an optional heat exchanger (not shown).
- the liquid is introduced at the top of each absorption stage 109, 110, e.g., liquid 118 is provided to the top of first absorption stage 109 and liquid from the stripper 120 is provided to the top of second absorption stage 110 of the wash vessel 102 (as the ammonia polishing stage).
- the liquid travels in a direction down a length of the wash vessel 102, which is countercurrent to a direction that the CO 2 lean flue gas 106 travels.
- the liquid travels in direction by virtue of gravity, while the CO 2 lean flue gas 106 travels in a countercurrent direction by virtue of several factors, including pressure drops within the wash vessel 102.
- the ammonia concentration in the liquid increases, thereby forming the ammonia-rich liquid 118.
- the ammonia concentration decreases, thereby forming a reduced ammonia-containing flue gas stream 124, which may be further treated such as being fed to a direct contact heater (DCH) and/or discharged into the atmosphere.
- DCH direct contact heater
- the amount of ammonia removed from the CO 2 lean flue gas 106 varies from system to system and application to application. It is also contemplated that the system be designed in a manner that the ammonia concentration in the reduced ammonia containing flue gas stream 124 is low and close to an equilibrium concentration of ammonia in the gas relative to the vapor pressure of the ammonia in the liquid.
- the equilibrium concentration of ammonia in the flue gas stream 124 may be as low as below ten parts per million (10 ppm) and typically in the range of between about zero parts per million (0 ppm) to about two hundred parts per million (200 ppm).
- the reduced ammonia containing flue gas stream 124 contains at least about seventy percent (70%) less ammonia as compared to a level of ammonia in the CO 2 lean flue gas 106. In another embodiment, the reduced ammonia containing flue gas stream 124 contains at least about seventy five percent (75%) less ammonia as compared to a level of ammonia in the CO 2 lean flue gas 106. In yet a further embodiment, the reduced ammonia containing flue gas stream 124 contains at least about eighty percent (80%) less ammonia as compared to a level of ammonia in the CO 2 lean flue gas 106.
- the reduced ammonia containing flue gas stream 124 contains at least about eighty five (85%) less ammonia as compared to a level of ammonia in the ammonia-containing flue gas stream 106. It is contemplated that the level of ammonia in the reduced ammonia containing flue gas stream 124 may be about ninety percent (90%), ninety five percent (95%), ninety nine percent (99%) or ninety nine and a half percent (99.5%) less than the level of ammonia in the CO 2 lean flue gas 106.
- An effective flow rate of liquid suitable to reduce the amount of ammonia in the flue gas varies from system to system.
- the flow rate is suitable to reduce an amount of ammonia in the flue gas to an amount close to the equilibrium concentration and typically to below two hundred parts per million (200 ppm) in the flue gas stream.
- the flow rate is suitable to reduce an amount of ammonia in the flue gas from about two thousand parts per million (2000 ppm) to between about seventy parts per million and about one hundred parts per million (70-100 ppm).
- the flow rate of the liquid is between about 1.8 liters per minute (1.8 lpm, or about 0.5 gallons per minute) to about 7.5 liters per minute (7.5 1pm or about 2 gallons per minute) per one thousand cubic feet per minute (1000 cfm) of flue gas.
- the liquid flow rate can be adjusted to the desired ammonia slip level from the wash vessel.
- the liquid falls to the bottom of the wash vessel 102 and is removed therefrom as ammonia-rich liquid 118.
- a portion of the ammonia-rich liquid 118 may be recycled to the wash vessel 102 as liquid (WW) and a portion of the ammonia-rich liquid may be sent to the nanofiltration or reverse osmosis (also referred to herein as "NF/RO") unit 108, which is in series with stripping column 120.
- NF/RO nanofiltration or reverse osmosis
- the entire amount of the ammonia-rich liquid 118 may be sent to the stripping column 120 and then returned to the wash vessel 102.
- the feed stream 118 to the NF/RO unit 108 can be either from pump 122 or via separate pump (not shown).
- the ammonia-rich liquid 118 fed to nanofiltration or reverse osmosis unit 108 is physically separated into two feed streams 130, 132.
- feed stream 130 the ammonia concentration is increased relative to the ammonia concentration of the ammonia-rich liquid feed stream 118 to form an increased molarity ammonia rich liquid stream (i.e., retentate), whereas in feed stream 132, the ammonia concentration is decreased relative to the ammonia concentration of the ammonia liquid stream 118 to form a decreased molarity ammonia rich liquid stream (i.e., permeate).
- the decreased molarity ammonia rich liquid stream 132 is recycled back to the second absorption stage 110 of the wash vessel 102 via liquid delivery system 116.
- the decreased molarity ammonia fluid stream 132 may be combined with stripped liquid 138 via conduit 133 after treatment in the stripper system 104.
- the stripped liquid 138 which is at an elevated temperature, passes through heat exchanger 136 so as to reduce the temperature of the stripped liquid 138.
- all or a portion of the stripped liquid 138 may be diverted directly to the direct contact cooler or direct contact heater as may be desired.
- a CO 2 loaded solution (slip stream) is sent from the CO 2 wash water (not shown; CO 2 product cooler which is also known as ammonia polishing stage for the CO 2 product) to the wash vessel 102 to reduce the ammonia slip.
- CO 2 product cooler which is also known as ammonia polishing stage for the CO 2 product
- a clean water solution 138 from the stripper 120 is sent to the CO 2 wash water via conduit 135 as shown in FIG. 1 to maintain the mass balance and the ammonia molarity in the CO 2 wash water.
- the increased molarity ammonia rich liquid stream 130 has an ammonia concentration higher than the wash liquid 118.
- the molarity of the washed liquid 118 in the water wash vessel 102 has a molarity of about 0.1 to 2.0 (mol NH3/liter of solution).
- the ammonia molarity of fluid stream 130 is increased to about 3 to about 6, and in other embodiments, the ammonia molarity is increased to 6 to about 9, and in still other embodiments, the ammonia molarity is increased to about 9 to about 12. In other words, the ammonia molarity is increased from about 3 to about 12.
- the temperature of the increased molarity ammonia-rich fluid stream 130 is increased by feeding the fluid stream through heat exchanger 136 prior to introduction into the stripper column 120, wherein the ammonia as well as other contaminants are removed from the increased molarity ammonia-rich fluid stream 130 to form an ammonia lean liquid 138, which may be pure water or substantially pure water having, for example, trace contaminants of ammonia.
- the stripping column 120 utilizes steam from reboiler 150 to remove the ammonia and the other contaminants from the increased molarity ammonia-rich fluid stream 130 to form the ammonia lean liquid 138 that can then be recycled to the wash vessel 102 or fed to the direct contact cooler or direct contact heater as may be desired in some applications. Recycling to the wash vessel 102 generally includes reducing the temperature of ammonia lean liquid 138 by feeding through heat exchanger 136 and then through chiller 131 prior to introduction into the wash vessel 102.
- stripping column 120 may utilize other technology or techniques in order to remove the ammonia and other contaminants from the increased molarity ammonia-rich fluid stream 130.
- the increased molarity ammonia-rich fluid stream 130a may be mixed with lean solution used in the absorber (ammonia solution or slurry) prior to introduction into the stripper to further increase the ammonia concentration of liquid 130 being fed to the stripper column 120 so as to further reduce the energy requirements of the stripper system 104.
- the stripping column 120 may be operated at vacuum conditions to reduce the temperature of the steam utilized in the stripping column.
- the slip stream (lean solution) from the absorber-regenerator loop is processed via an appendix stripper (not shown) to maintain the water balance within the process.
- the appendix stripper bottom is sent to the direct contact cooling or direct contact heating (DCC/DCH) section and the top portion which contains ammonia and CO 2 is sent to the absorber.
- DCC/DCH direct contact cooling or direct contact heating
- the additional appendix stripper for water balance is advantageously not needed and the slip stream from the absorber-regenerator loop can be combined directly with the nanofiltration or reverse osmosis retentate (assuming it will have the same ammonia molarity as the lean solution from the absorber-regenerator loop) before processing through stripper.
- the extra water from the stripper can be sent from the bottom portion of stripper 120 to the DCC/DCH section via conduit 139 as shown in Fig 1 .
- the fluid stream 140 including the recovered ammonia fluid and other volatile contaminants is discharged from a top portion 141 of the stripper column 120, cooled via chiller 142 and recycled to the absorber and/or recycled back to the stripper column 120.
- the recovered ammonia fluid stream 140 may be recycled for use in the absorber as an ammoniated solution.
- the ammonia may be utilized at other points inside and outside of system 100.
- stripper duty as a function of ammonia molality was measured in terms of kilowatts thermal (KWth) and kilowatts electrical-hours per kilogram of ammonia recovered (KWe-hr/kg NH 3 recovered).
- Inlet ammonia molality (m) was varied from about 1.50 to about 5.70 at a constant flow rate.
- the stripper feed had an Rvalue (moles NH 3 /moles CO 2 ) of 2.0, a stripper operating pressure of 1.7 bara, and a temperature of 110°C.
- the ammonia concentration of the liquid at the stripper bottom was at about 0.1 molar (M).
- FIG. 2 graphically illustrates stripper duty as a function of the ammonia molality. As shown in FIG. 2 , greater than about 50% stripper duty KWe-hr/kg NH 3 recovered can be reduced.
- stripper power consumption was measured as a function of ammonia slip from an absorber.
- the stripper feed from the water wash vessel had an Rvalue (moles of NH 3 /moles of CO 2 ) of 2.0, a stripper operating pressure of 1.7 bara, and temperature of 110°C.
- the inlet ammonia containing flue gas entering the wash vessel was varied between about 1800 to about 11,500 parts per million by volume (ppmv) at a constant flow rate.
- the ammonia concentration of the liquid at the stripper bottom was at about 0.1 molar.
- FIG. 3 graphically illustrates stripper power consumption as a function of ammonia slip from the absorber during operation. As shown, increasing the amount of ammonia slip from the water wash vessel resulted in a lower specific stripper duty per Kg of ammonia recovered, thereby requiring lower power consumption requirements.
- the high molarity retentate reduces the stripper steam consumption significantly as is evidenced by the data provided in FIG. 2 .
- Current chilled ammonia processes typically use a reduced liquid to gas ratio (L/G) of about 0.2-0.5 on a mass basis for the water wash vessel top section for reducing steam consumption in the stripper as the specific heat duty of the water is very high.
- L/G liquid to gas ratio
- the proposed process and system allows the use of a higher L/G ratio to further reduce ammonia slip from the water wash, which also allows (helps) in sufficient packing wetting. It is further evident from FIG.
- the wash water can operate at lower molarity and the stripper can operate at higher molarity, whereby ammonia slip from the wash water and the steam consumption of the stripper are both reduced.
- the higher molarity retentate also advantageously reduces the process equipment sizes by more than 50%, if desired.
- cross heat exchangers, strippers, reboiler, condensers and the like can be reduced, and in some instances, eliminated.
- first, second, and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
- the terms “a” and “an” herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
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Description
- The present disclosure generally relates to gas purification systems and processes of use, wherein absorbed ammonia and carbon dioxide are recovered. In particular, the present disclosure relates to wash systems and processes configured to utilize nanofiltration or reverse osmosis to reduce the steam duties of an ammonia recovery stripper for reducing the ammonia slip and other contaminants from a gas stream that has been subjected to an ammonia-based CO2 removal process.
- In conventional industrial technologies for gas purification, impurities, such as H2S, CO2 and/or COS are removed from a gas stream such as flue gas, natural gas, syngas or other gas streams by absorption in a liquid solution, e.g., in a liquid solution comprising ammonia and/or one or more amine compounds. The used liquid solution is subsequently regenerated in a regenerator column to release the impurities comprised in the solution, typically by countercurrent contacting with steam. The steam needed for regeneration is typically produced by power plant turbine system. In addition, a reboiler in fluid communication with the regeneration column may provide further release of impurities comprised in the liquid solution.
- In current chilled ammonia processes and systems, ammonia slip from the main CO2 absorber is first captured in a water wash vessel and subsequently regenerated in the ammonia recovery stripper by heating the ammoniated rich solution with saturated steam. The ammoniated slip solution typically has a NH3 molarity of 0.1 to 2.0 mol/liter depending on the operating conditions. The current ammonia recovery process from the stripper is an expensive process (approximately 20% heat duty of the main CO2 regenerator) in terms of both capital and operating cost because it is very difficult to integrate stripper overhead heat with the main regenerator network.
- Accordingly, there is a need for improved systems and processes for more efficiently recovering the ammonia slip so as to provide reduced energy consumption.
-
US 7,846,240 describes a method and system for reducing an amount of ammonia in a flue gas stream.US 2011/0100218 describes a method for combining desalination and osmotic power with carbon dioxide capture. -
DE 198 08 433 A1 describes a process and an apparatus for reducing ammonia from waste water. This process comprises a separating unit splitting the waste water in a retentate and a permeate. The retentate is conveyed to a stripping column where ammonia is stripped from the waste water. To reduce the energy consumption of the system gas from the top of the stripping column is conveyed to two catalysts where exothermic reactions take place to split or convert the ammonia to nitrogen and water. The heat from these exothermic reactions is recovered and used for heating the waste water before entering the stripping column. - Disclosed herein are gas purification systems and processes for more efficiently recovering the ammonia slip so as to provide reduced energy consumption, among other advantages. In one embodiment, a wash system for reducing ammonia slip in a chilled ammonia-based CO2 removal system comprising a main absorber and regenerator and also comprises a wash vessel configured to receive a CO2 lean flue gas subjected to the chilled ammonia-based CO2 removal system, the wash vessel comprising a liquid for washing the CO2 lean flue gas from the main absorber; a separation unit in series with the wash vessel and configured to receive washed liquid having an ammonia concentration from the wash vessel and physically separate the washed liquid into a first feed stream and a second feed stream, wherein the first feed stream has a decreased ammonia concentration relative to the ammonia concentration of the washed liquid, and wherein the second feed stream has an increased ammonia concentration relative to the ammonia concentration of the washed liquid; and a stripper system in series with the separation unit and configured to receive the second feed stream with the increased ammonia concentration.
- The process for reducing an amount of ammonia in a CO2 lean flue gas stream resulting from an ammonia-based CO2 capture system comprising a main absorber and regenerator comprises washing the CO2 lean flue gas stream from the main absorber in a wash vessel with a liquid to produce a washed liquid having an ammonia concentration; separating the washed liquid into a first feed stream and a second feed stream, wherein the first feed stream has a decreased ammonia concentration relative to the ammonia concentration of the washed liquid, and wherein the second feed stream has an increased ammonia concentration relative to the ammonia concentration of the washed liquid; and recovering ammonia from the second feed stream to produce an ammonia lean solution.
- The disclosure may be understood more readily by reference to the following detailed description of the various features of the disclosure and the examples included therein.
- Referring now to the figures wherein the like elements are numbered alike:
-
Figure 1 schematically illustrates a gas purification system in accordance with an embodiment of the present invention; -
Figure 2 graphically illustrates stripper duty as a function of ammonia molality; and -
Figure 3 graphically illustrates stripper power consumption as a function of ammonia slip from the absorber during operation. - Disclosed herein are systems and processes for purification of a gas stream such as a flue gas. More particularly, the systems and processes are configured to reduce the energy requirements of prior chilled ammonia processes and systems ("CAP") used in carbon capture systems ("CCS"). The systems and processes are configured to recover absorbed ammonia and carbon dioxide (CO2) from a flue gas stream that has been subjected to a chilled ammonia-based CO2 removal system. More particularly, ammonia and CO2 are recovered using nanofiltration or reverse osmosis on the feed stream from the wash vessel to provide a high molarity ammonia feed stream to the ammonia recovery stripper. The wash vessel is in fluid communication with the main absorber unit and is configured to receive the flue gas feed stream with the ammonia slip as well as other contaminants, i.e., the flue gas that has been subjected to ammonia-based CO2 removal. By increasing the molarity of the ammonia in the wash solution being fed to the ammonia recovery stripper, Applicants have discovered that steam consumption requirements are markedly reduced. Also, by increasing the ammonia molarity, the feed solution to the ammonia recovery stripper is reduced, which directly reduces the equipment sizes for stripper, reboiler, condensers, heat exchangers, pumps etc. The reduced steam consumption directly translates into significant energy savings.
- Referring now to
FIG. 1 , there is schematically illustrated a partial view ofwash system 100 in accordance with one embodiment for recovering ammonia slip in a chilled ammonia-based CO2 removal system generally including a main absorber and regenerator for treating a flue gas, for example. Thesystem 100 generally depicts, in series, awater wash vessel 102 for receiving an absorber retentate 106 (also referred to as the CO2 lean flue gas) from a main absorber (not shown), a nanofiltration orreverse osmosis system 108, and astripper system 104. It should be apparent that the complete chilled ammonia-based CO2 removal system will include additional components such as the main absorber and main regenerator as well as flue gas conditioning components for treating the flue gas stream prior to introduction into the main absorber and CO2 dehydration and compression components. Exemplary gas purification systems with these additional components, including but not limited to the absorber and the regenerator, are disclosed inUS Patent Nos. 7,641,717 ,7,846,240 , and7,862,788 . - The process stream employed in gas purification systems may be any fluid stream such as, for example, natural gas streams, synthesis gas streams, refinery gas or streams generated from combustion of materials such as coal, natural gas or other fuels. One example of process stream is a flue gas stream generated by combustion of a fuel such as, for example, coal, and provided at an output of a combustion chamber of a fossil fuel fired boiler. Examples of other fuels include, but are not limited to natural gas, synthetic gas (syngas), and petroleum refinery gas. Depending on the type of or source of the process stream, the acidic component(s) may be in a gaseous, liquid or particulate form. For ease of understanding, reference herein will be made to a flue gas stream.
- In one embodiment, the flue gas stream contains several acidic components including, but not limited to, CO2. By the time the flue gas stream enters the main absorber for CO2 capture system, the flue gas stream may have undergone treatment to remove particulate matter (e.g., fly ash), as well as sulfur oxides (SOx) and nitrogen oxides (NOx). For example, the flue gas may be taken from a location downstream of a wet flue gas desulfurization system. However, processes may vary from system to system and therefore, such treatments may occur after the flue gas stream passes through the absorber, or not at all.
- The main absorber employs an absorbent solution (disposed therein) that facilitates the absorption and the removal of a gaseous component such as carbon dioxide from the flue gas stream. In one embodiment, the absorbent solution includes a chemical solvent and water, where the chemical solvent contains, for example, a nitrogen-based solvent and, in particular, ammonia; primary, secondary and tertiary alkanolamines; primary and secondary amines; sterically hindered amines; and severely sterically hindered secondary aminoether alcohols. Examples of commonly used chemical solvents include, but are not limited to: ammonium carbonate, monoethanolamine (MEA), diethanolamine (DEA), diisopropanolamine (DIPA), N-methylethanolamine, triethanolamine (TEA), N-methyldiethanolamine (MDEA), piperazine, N-methylpiperazine (MP), N-hydroxyethylpiperazine (HEP), 2-amino-2-methyl-1-propanol (AMP), 2-(2-aminoethoxy)ethanol (also called diethyleneglycolamine or DEGA), 2-(2-tert-butylaminopropoxy)ethanol, 2-(2-tert-butylaminoethoxy)ethanol (TBEE), 2-(2-tert-amylaminoethoxy)ethanol, 2-(2-isopropylaminopropoxy)ethanol, 2-(2-(1-methyl-1-ethylpropylamino)ethoxy)ethanol, and the like. The foregoing may be used individually or in combination, and with or without other co-solvents, additives such as anti-foam agents, promoters such as enzymes, buffers, metal salts and the like, as well as corrosion inhibitors.
- In a chilled ammonia based CO2 capture system, the absorbent solution in the main CO2 absorber is a solution or slurry including ammonia. The ammonia can be in the form of ammonium ion, NH4 + or in the form of dissolved molecular NH3. By way of example, the absorbent solution or slurry may be comprised of ammonium carbonate, carbamate and bicarbonate ions. The absorption of the acidic components such as CO2 present in the flue gas stream is achieved when the absorber is operated at atmospheric pressure and at a low temperature, for example, between zero and thirty degrees Celsius (0-30°C). In another example, absorption of the acidic component from flue gas stream is achieved when the absorber is operated at atmospheric pressure and at a temperature between zero and ten degrees Celsius (0-10° C). By operating at relatively low temperatures, ammonia loss within the system is minimized.
- By way of example, the ammonia reacts with the CO2 present in the flue gas to form ammonium carbonate, ammonium bicarbonate, ammonium carbamate, and the like and form a CO2 lean flue gas stream. The process may generally be referred to as the main scrubbing process. After scrubbing, contaminants such as trace amounts of ammonia (also referred to as the ammonia slip), amine compounds and other degradation products remain in the CO2 lean flue gas. In the present disclosure, the CO2 lean flue gas with the contaminants is fed to an ammonia
slip recovery system 100, wherein the ammonia and other contaminants are removed from the CO2 lean flue gas, which may then be discharged into the atmosphere or further processed within a direct contact heater (DCH) before discharging to the atmosphere via stack. - The ammonia
slip recovery system 100 includes, in series, thewater wash vessel 102, the nanofiltration orreverse osmosis system 108, and thestripper system 104 to recover the ammonia, and other contaminants that may be contained therein. - The
wash vessel 102 generally includes one or more absorption stages. In the exemplary embodiment shown, the wash vessel includes afirst absorption stage 109 and asecond absorption stage 110. The wash vessel is not limited in this regard as it is contemplated that the wash vessel may have more or less absorption stages. Each of the absorption stages may include amass transfer device 112, aspray head system 114, and aliquid delivery path 116. The CO2lean flue gas 106 from the absorber (not shown) enters thefirst absorption stage 109 at a bottom portion of thewash vessel 102. While the opening is shown at the bottom portion, it is contemplated that the CO2lean flue gas 106 may be at any point in the wash vessel and may vary from system to system depending on the application. - The
mass transfer device 112 may include packing, such as, for example, random packing, hydrophilic packing, and/or structural packing. Random packing is generally known in the art and refers to packing material introduced to the absorption stage in an un-organized fashion. Examples of random packing include, but are not limited to plastic, metal and/or ceramic packing material offered in different sizes, e.g., material having varying diameters, for example, diameters ranging between about 2.5 centimeters (2.5 cm) to about 7.6 centimeters (7.6 cm) (about 1 inch to about 3 inches). Random packing material is available from many suppliers, including, but not limited to Jaeger Products Inc. (Houston, Tex., United States). Random packing material may also include wood. Hydrophilic packing includes, but is not limited to polypropylene bags. - Structural packing is generally known in the art and refers to packing material that is arranged or organized in a specific fashion. Typically, structural packing is arranged in a manner to force fluids to take a complicated path, thereby creating a large surface area for contact between the liquid and gas. Structural packing includes, but is not limited to structures made of metal, plastic, wood, and the like. It is contemplated that different packing materials facilitate ammonia removal or reduction at different flow rates of a liquid into the
wash vessel 102. Additionally, it is contemplated that the different packing materials may provide more suitable pressure drops. - In one embodiment, one of the absorption stages 109 or 110 of the
wash vessel 102 includes random packing material as themass transfer device 112 and another of the absorption stages 109 or 110 of thewash vessel 102 includes structural packing as the mass transfer device. For example,first absorption stage 109 may include random packing material as themass transfer device 112 andsecond absorption stage 110 may include structural packing as the mass transfer device. It is contemplated that the CO2lean flue gas 106 enters thewash vessel 102 and passes through thefirst absorption stage 109 prior to passing through thesecond absorption stage 110. - In each of the absorption stages 109, 110, the
mass transfer device 112 is located beneath thespray head system 114. Each of thespray head system 114 inwash vessel 102 sprays a liquid into the absorption stages 109, 110. The liquid is transported to thespray head system 114 via one of theliquid delivery paths 116. Theliquid delivery paths 116 are conduits that transport the liquid to the respectivespray head system 114. The liquid may be any liquid suitable to facilitate the removal of ammonia from the CO2lean flue gas 106. An example of a suitable liquid is water, which is known to absorb, i.e., dissolve, ammonia through interactions between the ammonia and the water. - In one particular embodiment, the liquid introduced to the
second absorption stage 110 is liquid, e.g., water, provided by a strippingcolumn 120. That is, water that has had all or substantially all of the ammonia as well as other contaminants contained therein removed and/or substantially removed. The liquid provided to thefirst absorption stage 109 is liquid 118 (also referred to as the washed liquid), which is water-containing a low concentration of ammonia recycled from the bottom of thewash vessel 102, which may be passed viapump 122 through an optional heat exchanger (not shown). - The liquid is introduced at the top of each
absorption stage first absorption stage 109 and liquid from thestripper 120 is provided to the top ofsecond absorption stage 110 of the wash vessel 102 (as the ammonia polishing stage). The liquid travels in a direction down a length of thewash vessel 102, which is countercurrent to a direction that the CO2lean flue gas 106 travels. As will be appreciated, the liquid travels in direction by virtue of gravity, while the CO2lean flue gas 106 travels in a countercurrent direction by virtue of several factors, including pressure drops within thewash vessel 102. - As the liquid travels down the length of the
wash vessel 102, the ammonia concentration in the liquid increases, thereby forming the ammonia-rich liquid 118. Conversely, as the CO2lean flue gas 106 travels in a direction up a length of thewash vessel 102, the ammonia concentration (as well as the concentration of the other water soluble contaminants) decreases, thereby forming a reduced ammonia-containingflue gas stream 124, which may be further treated such as being fed to a direct contact heater (DCH) and/or discharged into the atmosphere. - It should be appreciated that the amount of ammonia removed from the CO2
lean flue gas 106 varies from system to system and application to application. It is also contemplated that the system be designed in a manner that the ammonia concentration in the reduced ammonia containingflue gas stream 124 is low and close to an equilibrium concentration of ammonia in the gas relative to the vapor pressure of the ammonia in the liquid. The equilibrium concentration of ammonia in theflue gas stream 124 may be as low as below ten parts per million (10 ppm) and typically in the range of between about zero parts per million (0 ppm) to about two hundred parts per million (200 ppm). In one embodiment, the reduced ammonia containingflue gas stream 124 contains at least about seventy percent (70%) less ammonia as compared to a level of ammonia in the CO2lean flue gas 106. In another embodiment, the reduced ammonia containingflue gas stream 124 contains at least about seventy five percent (75%) less ammonia as compared to a level of ammonia in the CO2lean flue gas 106. In yet a further embodiment, the reduced ammonia containingflue gas stream 124 contains at least about eighty percent (80%) less ammonia as compared to a level of ammonia in the CO2lean flue gas 106. In another embodiment, the reduced ammonia containingflue gas stream 124 contains at least about eighty five (85%) less ammonia as compared to a level of ammonia in the ammonia-containingflue gas stream 106. It is contemplated that the level of ammonia in the reduced ammonia containingflue gas stream 124 may be about ninety percent (90%), ninety five percent (95%), ninety nine percent (99%) or ninety nine and a half percent (99.5%) less than the level of ammonia in the CO2lean flue gas 106. - An effective flow rate of liquid suitable to reduce the amount of ammonia in the flue gas varies from system to system. In one embodiment, the flow rate is suitable to reduce an amount of ammonia in the flue gas to an amount close to the equilibrium concentration and typically to below two hundred parts per million (200 ppm) in the flue gas stream. In another embodiment, the flow rate is suitable to reduce an amount of ammonia in the flue gas from about two thousand parts per million (2000 ppm) to between about seventy parts per million and about one hundred parts per million (70-100 ppm). In another embodiment, the flow rate of the liquid is between about 1.8 liters per minute (1.8 lpm, or about 0.5 gallons per minute) to about 7.5 liters per minute (7.5 1pm or about 2 gallons per minute) per one thousand cubic feet per minute (1000 cfm) of flue gas. The liquid flow rate can be adjusted to the desired ammonia slip level from the wash vessel.
- Still referring to
FIG. 1 , the liquid falls to the bottom of thewash vessel 102 and is removed therefrom as ammonia-rich liquid 118. A portion of the ammonia-rich liquid 118 may be recycled to thewash vessel 102 as liquid (WW) and a portion of the ammonia-rich liquid may be sent to the nanofiltration or reverse osmosis (also referred to herein as "NF/RO")unit 108, which is in series with strippingcolumn 120. Additionally, while not shown, it is contemplated that the entire amount of the ammonia-rich liquid 118 may be sent to the strippingcolumn 120 and then returned to thewash vessel 102. Thefeed stream 118 to the NF/RO unit 108 can be either frompump 122 or via separate pump (not shown). - The ammonia-
rich liquid 118 fed to nanofiltration orreverse osmosis unit 108 is physically separated into twofeed streams feed stream 130, the ammonia concentration is increased relative to the ammonia concentration of the ammonia-richliquid feed stream 118 to form an increased molarity ammonia rich liquid stream (i.e., retentate), whereas infeed stream 132, the ammonia concentration is decreased relative to the ammonia concentration of theammonia liquid stream 118 to form a decreased molarity ammonia rich liquid stream (i.e., permeate). - The decreased molarity ammonia rich
liquid stream 132 is recycled back to thesecond absorption stage 110 of thewash vessel 102 vialiquid delivery system 116. The decreased molarityammonia fluid stream 132 may be combined with stripped liquid 138 viaconduit 133 after treatment in thestripper system 104. The strippedliquid 138, which is at an elevated temperature, passes throughheat exchanger 136 so as to reduce the temperature of the strippedliquid 138. Optionally, all or a portion of the stripped liquid 138 may be diverted directly to the direct contact cooler or direct contact heater as may be desired. - In a typical chilled ammonia process, a CO2 loaded solution (slip stream) is sent from the CO2 wash water (not shown; CO2 product cooler which is also known as ammonia polishing stage for the CO2 product) to the
wash vessel 102 to reduce the ammonia slip. In the present disclosure, aclean water solution 138 from thestripper 120 is sent to the CO2 wash water viaconduit 135 as shown inFIG. 1 to maintain the mass balance and the ammonia molarity in the CO2 wash water. - After treatment in the nanofiltration or
reverse osmosis unit 108, the increased molarity ammonia richliquid stream 130 has an ammonia concentration higher than thewash liquid 118. Typically, the molarity of the washed liquid 118 in thewater wash vessel 102 has a molarity of about 0.1 to 2.0 (mol NH3/liter of solution). By feeding the washed liquid 118 into the nanofiltration orreverse osmosis unit 108, the molarity of thefluid stream 130 increases prior to introduction into thestripper column 120. In one embodiment, the ammonia molarity offluid stream 130 is increased to about 3 to about 6, and in other embodiments, the ammonia molarity is increased to 6 to about 9, and in still other embodiments, the ammonia molarity is increased to about 9 to about 12. In other words, the ammonia molarity is increased from about 3 to about 12. - The temperature of the increased molarity ammonia-
rich fluid stream 130 is increased by feeding the fluid stream throughheat exchanger 136 prior to introduction into thestripper column 120, wherein the ammonia as well as other contaminants are removed from the increased molarity ammonia-rich fluid stream 130 to form an ammonialean liquid 138, which may be pure water or substantially pure water having, for example, trace contaminants of ammonia. The strippingcolumn 120 utilizes steam fromreboiler 150 to remove the ammonia and the other contaminants from the increased molarity ammonia-rich fluid stream 130 to form the ammonialean liquid 138 that can then be recycled to thewash vessel 102 or fed to the direct contact cooler or direct contact heater as may be desired in some applications. Recycling to thewash vessel 102 generally includes reducing the temperature of ammonialean liquid 138 by feeding throughheat exchanger 136 and then throughchiller 131 prior to introduction into thewash vessel 102. - It is contemplated that stripping
column 120 may utilize other technology or techniques in order to remove the ammonia and other contaminants from the increased molarity ammonia-rich fluid stream 130. In one embodiment, the increased molarity ammonia-rich fluid stream 130a may be mixed with lean solution used in the absorber (ammonia solution or slurry) prior to introduction into the stripper to further increase the ammonia concentration ofliquid 130 being fed to thestripper column 120 so as to further reduce the energy requirements of thestripper system 104. Optionally, the strippingcolumn 120 may be operated at vacuum conditions to reduce the temperature of the steam utilized in the stripping column. In a typical Chilled Ammonia Process, the slip stream (lean solution) from the absorber-regenerator loop is processed via an appendix stripper (not shown) to maintain the water balance within the process. The appendix stripper bottom is sent to the direct contact cooling or direct contact heating (DCC/DCH) section and the top portion which contains ammonia and CO2 is sent to the absorber. In the proposed process described herein, it is expected that the additional appendix stripper for water balance is advantageously not needed and the slip stream from the absorber-regenerator loop can be combined directly with the nanofiltration or reverse osmosis retentate (assuming it will have the same ammonia molarity as the lean solution from the absorber-regenerator loop) before processing through stripper. The extra water from the stripper can be sent from the bottom portion ofstripper 120 to the DCC/DCH section viaconduit 139 as shown inFig 1 . - The
fluid stream 140 including the recovered ammonia fluid and other volatile contaminants is discharged from atop portion 141 of thestripper column 120, cooled viachiller 142 and recycled to the absorber and/or recycled back to thestripper column 120. For example, the recoveredammonia fluid stream 140 may be recycled for use in the absorber as an ammoniated solution. However, it is contemplated that the ammonia may be utilized at other points inside and outside ofsystem 100. - The following examples illustrate one or more embodiments described herein. The examples are not meant to limit the subject matter disclosed herein, but rather to illustrate one or more of the embodiments.
- In this example, stripper duty as a function of ammonia molality was measured in terms of kilowatts thermal (KWth) and kilowatts electrical-hours per kilogram of ammonia recovered (KWe-hr/kg NH3 recovered). Inlet ammonia molality (m) was varied from about 1.50 to about 5.70 at a constant flow rate. The stripper feed had an Rvalue (moles NH3/moles CO2) of 2.0, a stripper operating pressure of 1.7 bara, and a temperature of 110°C. The ammonia concentration of the liquid at the stripper bottom was at about 0.1 molar (M).
FIG. 2 graphically illustrates stripper duty as a function of the ammonia molality. As shown inFIG. 2 , greater than about 50% stripper duty KWe-hr/kg NH3 recovered can be reduced. - In this example, stripper power consumption was measured as a function of ammonia slip from an absorber. The stripper feed from the water wash vessel had an Rvalue (moles of NH3/moles of CO2) of 2.0, a stripper operating pressure of 1.7 bara, and temperature of 110°C. The inlet ammonia containing flue gas entering the wash vessel was varied between about 1800 to about 11,500 parts per million by volume (ppmv) at a constant flow rate. The ammonia concentration of the liquid at the stripper bottom was at about 0.1 molar.
FIG. 3 graphically illustrates stripper power consumption as a function of ammonia slip from the absorber during operation. As shown, increasing the amount of ammonia slip from the water wash vessel resulted in a lower specific stripper duty per Kg of ammonia recovered, thereby requiring lower power consumption requirements. - Advantageously, the high molarity retentate reduces the stripper steam consumption significantly as is evidenced by the data provided in
FIG. 2 . Current chilled ammonia processes typically use a reduced liquid to gas ratio (L/G) of about 0.2-0.5 on a mass basis for the water wash vessel top section for reducing steam consumption in the stripper as the specific heat duty of the water is very high. The proposed process and system allows the use of a higher L/G ratio to further reduce ammonia slip from the water wash, which also allows (helps) in sufficient packing wetting. It is further evident fromFIG. 2 that the higher ammonia molarity in the stripper requires lower steam consumption but in the current chilled ammonia process it is not possible to operate the wash water at higher molarity otherwise the lower ammonia slip from the wash water cannot be maintained. In the proposed process, the wash water can operate at lower molarity and the stripper can operate at higher molarity, whereby ammonia slip from the wash water and the steam consumption of the stripper are both reduced. - The higher molarity retentate also advantageously reduces the process equipment sizes by more than 50%, if desired. For example, cross heat exchangers, strippers, reboiler, condensers and the like can be reduced, and in some instances, eliminated.
- Regarding
FIG.3 , it is evident that the lower the ammonia slip from the absorber, the higher the specific energy consumption. Because of this relationship, the main absorber can operate at a higher temperature to provide higher ammonia slip, which ultimately will reduce the chiller duty in the absorber. This will directly save significant chiller power for the chilled ammonia process, thereby providing additional savings. By increasing the ammonia molarity, the specific stripper energy consumptions are exponentially reduced. Another advantage is that the main stripper can now be used for both ammonia recovery and water balance, thereby making it possible to eliminate an appendix stripper (assuming the nanofiltration or reverse osmosis retentate has the same ammonia molarity as the lean solution from the regenerator). - The terms "first," "second," and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The terms "a" and "an" herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
- While the invention has been described with reference to various exemplary embodiments, it will be understood by those skilled in the art that the invention will include all embodiments falling within the scope of the appended claims.
Claims (9)
- A wash system (100) for removing ammonia slip in a chilled ammonia-based CO2 removal system comprising a main absorber and regenerator, the wash system comprising:a wash vessel (102) configured to receive at a bottom portion a CO2 lean flue gas subjected to the chilled ammonia-based CO2 removal system, and configured to receive a liquid for washing the CO2 lean flue gas from the main absorber;wherein the wash vessel (102) comprises a first absorption stage (109) and a second absorption stage (110) and is configured such that a first portion of the washed liquid (118) from the bottom of the wash vessel (108) isrecycled to the first absorption stage (109)and that the CO2 lean flue gas (106) enters the wash vessel (102) and passes through the first absorption stage (109) prior to passing through the second absorption stage (110);a separation unit (108) in series with the wash vessel (102) and configured to receive a second portion of the washed liquid (118) having an ammonia concentration from the wash vessel (102) and physically separate the washed liquid (118) into a first feed stream (132) and a second feed stream (130), wherein the first feed stream (132) has a decreased ammonia concentration relative to the ammonia concentration of the washed liquid (118) and is recycled back to the second absorption stage (110) of the wash vessel (102) via liquid delivery system (116), and wherein the second feed stream (130) has an increased ammonia concentration relative to the ammonia concentration of the washed liquid (118), wherein the separation unit (108) is a nanofiltration or reverse osmosis unit;a stripper system (104) in series with the separation unit (108) and configured to receive the second feed stream (130) with the increased ammonia concentration from the separation unit (108), wherein the stripper system (104) comprises a stripper column (120) and a reboiler (150) in fluid communication therewith to remove ammonia from the second feed stream (130) to produce an ammonia lean solution (138); anda conduit (133) to combine at least a portion of the ammonia lean solution (138) with the first feed stream (132).
- The wash system of claim 1, further comprising a liquid delivery system for introducing the first feed stream (132) from the separation unit to the wash vessel.
- The wash system of claim 1, wherein the wash vessel (102) is in fluid communication with a direct contact heater for receiving a washed flue gas from the wash vessel (102).
- The wash system of claim 1, wherein at least a portion of the ammonia lean solution(138) is diverted to a CO2 wash water feed stream of the main absorber in an amount effective to maintain mass balance and ammonia molarity of the CO2 wash water.
- A process for reducing an amount of ammonia in a CO2 lean flue gas stream (106) resulting from a chilled ammonia-based CO2 capture system comprising a main absorber, regenerator and a wash system (100) according to one of the preceding claims, the process comprising:washing the CO2 lean flue gas stream from the main absorber in a wash vessel (102) with a liquid to produce a washed liquid having an ammonia concentration; recycling a first portion of the washed liquid (118) to the first absorption stage (109);separating a second portion of the washed liquid in a nanofiltration or reverse osmosis process into a first feed stream (132) and a second feed stream (130), wherein the first feed stream (132) has a decreased ammonia concentration relative to the ammonia concentration of the washed liquid, and wherein the second feed stream (130) has an increased ammonia concentration relative to the ammonia concentration of the washed liquid; recycling back the first feed stream (132) to the second absorption stage (110);recovering ammonia from the second feed stream (130) with a stripper system (104) to produce an ammonia lean solution; andproviding a combination of at least a portion of the an ammonia lean solution (138) and of the first feed stream (132) to the second absorption stage (110) of the wash vessel (102).
- The process of claim 5, wherein the liquid is water.
- The process of claim 5, further comprising providing at least a portion of the ammonia lean solution to a direct contact cooler and/or direct contact heater.
- The process of claim 5, further comprising providing the recovered ammonia to an absorber of the ammonia-based CO2 removal system.
- The process of claim 5, wherein the main absorber operates at a higher temperature to provide an increased ammonia slip with the CO2 lean flue gas introduced into the wash vessel and reduce a chiller duty associated with the main absorber relative to a chilled ammonia system without the separation unit configured to provide the second feed stream with the increased ammonia concentration.
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Application Number | Priority Date | Filing Date | Title |
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US13/275,552 US9901861B2 (en) | 2011-10-18 | 2011-10-18 | Chilled ammonia based CO2 capture system with wash system and processes of use |
PCT/US2012/060356 WO2013059155A1 (en) | 2011-10-18 | 2012-10-16 | Chilled ammonia based co2 capture system with wash system and processes of use |
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EP2780099A1 EP2780099A1 (en) | 2014-09-24 |
EP2780099B1 true EP2780099B1 (en) | 2018-08-15 |
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EP (1) | EP2780099B1 (en) |
CN (1) | CN103857457B (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130175004A1 (en) * | 2012-01-06 | 2013-07-11 | Alstom Technology Ltd | Gas treatment system with a heat exchanger for reduction of chiller energy consumption |
US9138677B2 (en) * | 2013-07-25 | 2015-09-22 | Alstom Technology Ltd | Ammonia stripper for a carbon capture system for reduction of energy consumption |
US9452389B2 (en) | 2014-02-28 | 2016-09-27 | General Electric Technology Gmbh | Apparatus and method for integrating desulfurization and carbon dioxide capture |
BR112017003875A2 (en) * | 2014-08-25 | 2018-01-23 | Basf Se | absorbent and process for removing carbon dioxide from a fluid stream. |
TWI546118B (en) * | 2014-09-04 | 2016-08-21 | Univ Nat Tsing Hua | Carbon dioxide capture system |
US9573816B2 (en) * | 2015-04-02 | 2017-02-21 | General Electric Technology Gmbh | System for low pressure carbon dioxide regeneration in a chilled ammonia process |
LU100469B1 (en) | 2017-10-09 | 2019-04-09 | Cppe Carbon Process & Plant Eng S A | Elimination of SO2 and CO2 from a gas |
CN109200758B (en) * | 2018-09-05 | 2021-05-18 | 中石化上海工程有限公司 | Method for recovering pressure energy of ethylene device |
CN113041787A (en) * | 2019-12-26 | 2021-06-29 | 国家能源投资集团有限责任公司 | Method and device for recovering diluted amine liquid |
US11534732B2 (en) * | 2020-02-26 | 2022-12-27 | Uop Llc | Process and apparatus for quenching a reactor effluent stream |
CN115259259B (en) * | 2022-07-18 | 2023-06-16 | 陕西未来能源化工有限公司 | System and process for treating conversion condensate |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3219701A1 (en) | 1982-05-26 | 1983-12-01 | Ruhrkohle Ag, 4300 Essen | TREATMENT OF GAS CONDENSATES |
US5766479A (en) * | 1995-08-07 | 1998-06-16 | Zenon Environmental Inc. | Production of high purity water using reverse osmosis |
DE19808433A1 (en) | 1998-03-02 | 1999-09-09 | Fresenius | Method and device for removing or reducing the ammonium content from waste water |
JP3969949B2 (en) * | 2000-10-25 | 2007-09-05 | 関西電力株式会社 | Amine recovery method and apparatus, and decarbonation gas apparatus provided with the same |
WO2006022885A1 (en) | 2004-08-06 | 2006-03-02 | Eig, Inc. | Ultra cleaning of combustion gas including the removal of co2 |
WO2008141195A1 (en) * | 2007-05-09 | 2008-11-20 | Powerspan Corp. | Carbon dioxide scrubbing with ammonium carbonate and ammonia vapor control |
US7981196B2 (en) * | 2007-06-04 | 2011-07-19 | Posco | Apparatus and method for recovering carbon dioxide from flue gas using ammonia water |
US8182577B2 (en) * | 2007-10-22 | 2012-05-22 | Alstom Technology Ltd | Multi-stage CO2 removal system and method for processing a flue gas stream |
US7862788B2 (en) | 2007-12-05 | 2011-01-04 | Alstom Technology Ltd | Promoter enhanced chilled ammonia based system and method for removal of CO2 from flue gas stream |
US7846240B2 (en) * | 2008-10-02 | 2010-12-07 | Alstom Technology Ltd | Chilled ammonia based CO2 capture system with water wash system |
US8007570B2 (en) | 2009-03-11 | 2011-08-30 | General Electric Company | Systems, methods, and apparatus for capturing CO2 using a solvent |
CN101837723A (en) | 2009-03-16 | 2010-09-22 | 葛振志 | Pneumatic and power-driven mixed hybrid electric vehicle |
US8551221B2 (en) * | 2009-11-02 | 2013-10-08 | Thomas D. Wolfe | Method for combining desalination and osmotic power with carbon dioxide capture |
US20110146489A1 (en) | 2009-12-17 | 2011-06-23 | Alstom Technology Ltd | Ammonia removal, following removal of co2, from a gas stream |
-
2011
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US20130092026A1 (en) | 2013-04-18 |
CA2852237C (en) | 2016-06-21 |
CA2852237A1 (en) | 2013-04-25 |
CN103857457B (en) | 2017-02-15 |
EP2780099A1 (en) | 2014-09-24 |
WO2013059155A1 (en) | 2013-04-25 |
AU2012326392A1 (en) | 2014-05-08 |
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